When importing bitmaps into illustrator, pixel preview doesn't appear much different than overprint preview. Is there a way I can make this appear as a more accurate live version rather than a pixelated, undetailed one like in CS4?

So basically most textile and apparel designers will import bitmaps into illustrator and then in pixel preview, it gives a more accurate/non pixelated and smooth clean view of the graphic as it would appear once screen printed. The bitmaps all represent seperate screens. In CS6, pixel preview looks the same as overprint preview in that it is still that pixelated, bitmap appearance. If I save the file as a PDF or jpg it appears correct, just annoying as it was easier to work on it live with an accurate view in illustrator.